Sensor Module and Rack AIC ratings

Module/Rack AIC Ratings

A.I.C. is an acronym for "Ampere Interrupt Current". It has been replaced recently by the term "RMS Symmetrical Current". The AIC rating is the maximum current that can flow through a piece of equipment without permanent damage. If a direct short is applied between the phase bars of a rack, this allows the current protection to trip before damage occurs.

At ETC, we typically use this term when referring to dimming racks. Here are the guidelines:

Sensor SR/SRN Series Racks
The dimmer module in the rack with the lowest AIC rating determines the AIC rating for the entire dimming rack.

For Unison DR Series Racks
The racks have the following AIC ratings:

DR6

Maximum of 10,000 AIC

DR6 at 277V

Maximum of 14,000AIC

DR12

Maximum of 22,600 AIC

DR12 with Aux Rack

Maximum of 66,800 AIC

You apply the DR rack rating first and then, the dimmer module in the rack with the lowest AIC rating determines the AIC rating for the entire dimming rack. (A D20 with an AIC of 100,000 in a DR6 would give you a total AIC for the installation of 10,000)